Roller mill



Dec. 26, 1939. G, JACK 2,185,150

ROLLER MILL Filed Oct. 29, 1958 3 Sheets-Sheet l lNvENToR.

eorge Jac/f ATTORNEYS.

Dec. 26, 1939. JACK 2,185,150

ROLLER MILL Filed Oct. 29, 1938 3 Sheets-Sheet 2 INVENTOR.

Dec. 26, 1939.

G. JACK ROLLER MILL Filed Oct. 29, 1938 3 Sheets-Sheet 5 INVENTQR.

prge Jac/f ATTORNEYS.

Patented Dec. 26, 1939 UNITED STATES ROLLER. MILL George Jack, Rochelle Park, N. J., assignor to J. M. Lehmann Co., Inc., New York, N. Y., a corporation of New York Application October 29, 1938, Serial No. 237,656

Claims.

This invention relates to roller mills, more particularly to improved roll adjusting means, and has for an object the provision of improvements in this art.

The patent to Richard Goll, No. 2,093,606 discloses a roller mill having a plurality of movable rolls which are moved different distances to separate them from a fixed roll and from each other. Mills of this type are employed for grinding cocoa, chocolate, paint, ink, pigments, and the like, and the roll separation is advantageous for cleaning, inspection and other purposes.

TheI mill shown in the Goll patent employs eccentrics of different throw for moving the rolls different distances when the eccentrics are turned through equal angles, as may conveniently be done by the unitary coordinated control pro'- vided. This mill has proved very eiiicient and convenient in service; but the present invention provides improvements which make the mill even more convenient and also reduces the cost of construction as Well as assuring greater certainty that the mill will be assembled and repaired correctly, even by relatively unskilled mechanics.

'I'his is accomplished by employing identical eccentrics for all the movable rolls and moving the eccentrics through different arcs by means which compensate for the different arcs of movement in order that a unitary control may move each roll accurately through the required distance. The mill shown in the patent also provided for making ne adjustments to the rolls independently of the quick throw-out adjustment provided by the eccentrics. The present inventhe same time retaining the ne adjustment in unimpaired form. This invention also provides, as did the patented device, that in working position all rolls are locked in place as by setting the eccentrics and operating means therefor in dead center position.

An exemplary embodiment of the invention is shown in the accompanying drawings, wherein:

Fig. 1 is a side elevation of a roller mill with the rolls in closed position;

Fig. 2 is a front elevation, partly broken away to show the roll adjusting mechanism;

Fig. 3 is a sectional view through the roll adjusting mechanism at one end of the mill; and

Fig. 4 is a fragmentary section taken on the line 4-4 of'Fig. 3.

Referring to the drawings, the mill comprises a frame I5 in which are operatively mounted a plurality of rolls I6, I1, I8 and I9, the lowest roll I9 being fixed and the rolls I8, Il and I6 which tion provides the desired improvements while at are in train therewith being movable from and toward the fixed roll by progressively increasing distances. Preferably, as shown, the rolls are mounted in line for better pressure, adjustment and inspection conditions. More specifically, the '5 axes of the rolls are located in a single plane and parallel to each other. 'Ihe journals of the rolls are mounted in bearing blocks 20 which in the present embodiment are slldably mounted in guides in the side standards of the frame I5.

The bearing blocks 20 for each roll may be independently adjusted in the frame for fine setting by means generally designated by the numeral 2|, this means including a worm gear 61 operating between iiXed abutments 69 and 'l0 and 15 threaded on a rod 66 provided with a shaft bearing head 24 at its end. The gear 61 is turned by a worm 68 on a shaft 22 provided with a hand wheel 23. The fine adjustment is effected through but independently of quick throw-out adjustment means which will now be described.

The quick throw-out means comprises an eccentric shaft 26 having its eccentric portion 65 journaled in the bearing in the head 24 of the rod 66. The aligned ends 28, 28' of the shaft are journaled 25 in bearings in lugs 25, 25 carried by the bearing blocks 20. Bushings may be provided for the bearings. as shown, there being a bushing 21 for the bearing in head 24 for the eccentric 65 and a bushing 29 for the shaft end 28. The portions 30 28, and 28 of the shaft 26 are conveniently made of progressively decreasing size for easy assembly but it is readily apparent by the center lines shown in Fig. 3 that the portions 28 and 28' are in alignment and that the portion 65 is eccen- 35 trically formed on the shaft.

Suitable means such as levers, gears or the like are provided for actuating the shaft 26. As shown, a lever 30 is formed integral with or is rigidy mounted on each shaft 26.

'Ihe crank arms 30 are normally disposed in a raised position, as shown i'n Fig. 1, and the eccentrics 65 are in dead center position when the rolls are in closed position. 'I'he rolls are thus locked in opere tive relationship and any ne adjustment 45 which is made through the rods 66 by the hand wheels 23 will not change the angular position of the eccentrics but will merely raise and lower the eccentrics bodily as the shafts 26 may b e raised or lowered.

The eccentric for each roll bearing is made identical with the eccentric of every other roll bearing. This is very economical from a manufacturing standpoint since it provides that all parts which require expensive machine opera- 55 tions are standardized, leaving only those parts which may be cheaply manufactured to be made of a non-uniform or non-standard size. Moreover, the innermost parts are made identical and standardized, leaving only the outermost or accessible parts to be made of special sizes. Furthermore, since the eccentrics, if made individually different, would vary in size by only a relatively small amount it would be easy to mix them during assembly and itis an expensive task to disassemble and re-assemble a mill to correct this mistake if made. If identical eccentrics are used, as hereby contemplated, it is impossible to assemble the partsimproperly, even when relatively unskilled mechanics are employed, and the parts which are different are placed on the outside where they may be readily changed; but their diierences in size are so pronounced as to be very obvious, making it almost impossible to assemble them improperly.

The eccentric portion 65 of each shaft 26 is so disposed relative to the bearing blocks 20 that when the crank arms 30 of all the connections are moved in one direction the blocks will be correspondingly moved in such directions as to space the rolls apart for cleaning, inspection or other operations required in the running of the mill.

'I'he arms 30 all extend laterally in the same direction but preferably, as shown, at different angles with reference to the horizontal. They are of different lengths and the lengths are so proportioned as to compensate for the eccentrics being all of one size. The ends of the arms 30 are connected for unitary operation by links 3l and 3| and all arms are operated by links 32 pivoted to crank arms 33 carried by the ends of a crank shaft 34 mounted in the frame I5 and provided with a single hand operating handle 35.

In the normal or working position of the rolls the links 32 and crank arms 33 are in dead center position so as to lock the parts securely against displacement.

As shown by dotted lines in Fig. l, the crank arm 33 and the handle 35 swing through a substantial arc from the dead center position. This draws the links 32, 3| and 3|' and the ends of the arms 30 downward and separates the rolls. However, due to the fact-that the arms 30 are of diiierent lengths, they and the eccentrics 65 are turned through different angles of movement to move the rolls by, different amounts.

the rolls are spaced apart by substantially equal amounts. It is also to be noted that the arms 30 for all rolls make approximately equal angles with the horizontal in the open position of the rolls. This permits effective action of the arm operating linkages.

It will be noted that the quick lthrow-out movement does not disturb the fine adjustment of the rolls and that consequently when they are again closed they will accurately resume their former positions.

The operation will be obvious from the foregoing description. While one embodiment of the invention has been disclosed for purposes of il- The parts j are 'so proportioned that in their open positions lustration lt is to be understood that the invention may be variously embodied within the limits of the prior art and the scope ofthe subjoined claims.

What I claim is:

1. A roller mill comprising in combination, a frame, a fixed roll mounted in said frame, a plurality of adjustable rolls mounted in train on one side of the xed roll, bearings for the adjustable rolls shlftably mounted in the frame, identical eccentrics supporting all of said bearings, supports for lsaid eccentrics, fine adjustment means for moving each eccentric support bodily with its roll bearing, levers oi' different lengths for the eccentrics of diierent movable rolls, a plurality of links connecting the ends of all levers 'at-each end of the frame, and unitary means for simultaneously moving all the links and levers for quickly throwing out all movable rolls independently of said fine adjustment means.

2. A roller mill comprising in combination, a frame, a xed roll mounted in said frame, a plurality of adjustable rolls mounted in said frame in train on one side of the xed roll, shiftable bearings for the adjustable rolls, quick throw-out means for adjusting said shiftable bearings, said means including identical eccentrics for all of said rolls, unitary means lfor simultaneously moving the eccentrics of the rolls through different angles to move the rolls through diierent disstances, and additional means for separately adjusting the bearings lof each movable roll independently of the rst mentioned roll adjusting means.

3. A roller mill comprising in combination, a frame, a xed roll mounted in said frame, a plurality of adjustable rolls mounted in said frame in train on one side of the iixed roll, shiftable bearings for the' adjustable rolls, and means for adjusting said shiftable bearings, said meansincluding identical eccentrics for all of said rolls, arms of dierent lengths connected to the eccentrics of different rolls, and unitary means for simultaneously moving the arms of the rolls through different angles to move the rolls through diii'erent distances.

4. A roller mill comprising in combination, a frame, a xed roll mounted in said frame, a plurality of adjustable rolls mounted in said frame in train on one side of the xed roll, shiftable bearings for the adjustable rolls, and means for adjusting said shiftable bearings, said means including identical eccentrics for all of said rolls, and unitary means for simultaneously moving the eccentrics of the rolls through different angles to move the rolls through diierent distances.

5. A roller mill comprising in combination, a frame, a stationary roll mounted in said frame, a plurality of adjustable rolls mounted in said frame in train on one side of the iixed roll, and means for adjusting said movable rolls, said means including identical eccentrics for all of the rolls, and unitary means for simultaneously moving the eccentrics of the rolls through different angles to move the rolls through different distances. A

GEORGE JACK. 

